spectral tuning and daylight - energy.govled track discussion iii: luminaire concepts spectral...
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![Page 1: Spectral Tuning and Daylight - Energy.govLED TRACK DISCUSSION III: LUMINAIRE CONCEPTS Spectral Tuning and Daylight Steve Paolini, Telelumen LLC. 30JAN19. Westin Hotel, Dallas, TX •](https://reader033.vdocument.in/reader033/viewer/2022041607/5e354a42fe77bc58975bf6cc/html5/thumbnails/1.jpg)
LED TRACK DISCUSSION III: LUMINAIRE CONCEPTS
Spectral Tuning and DaylightSteve Paolini, Telelumen LLC
30JAN19
Westin Hotel, Dallas, TX
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• Founded 2007 – Saratoga, CA• Purpose – Replicate any spectral power distribution
• Products and services to create and playback light• Privately owned• Products:
• Octa (8 color light player luminaire) • Developer Software• LumenScripts/LightTunes (content)
Copyright Telelumen LLC 2019 All Rights Reserved
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Target Applications• Healthcare – faster healing, wake/sleep improvement• Retail – make products more appealing• Workplace – increase productivity, wellbeing• Lighting company – designer spectrum, focus group evaluations• Horticulture – plant growth• Aquariums – fish, coral• Sensors – firmware development• Color quality – metrics, process control• Movie, TV – outdoor scene and filter replication
Copyright Telelumen LLC 2019 All Rights Reserved
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What is Mood/Human Centric Lighting?• Depends who you ask.• A fundamental aspect is the daylight experience. • Daylight is complex. The SPD changes with:
– time of day– the weather– time of year– place on earth– your immediate environment – window, sidewalk, park, …
• Chromaticity is typically not on the black body or daylight locus and does not define SPD.
• Fire can be relaxing, romantic, frightening
Copyright Telelumen LLC 2019 All Rights Reserved
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SPD is the definitive signature of light
CCT and chromaticity are not enough
Always provide/ask for the SPD
Copyright Telelumen LLC 2018 All Rights Reserved
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Tunable spectrum challenges
• Multi-channel drivers– Ideally both AM and PWM under digital control– At least 16-bits of dynamic range (future 20-bits)
• Multi channel color sensors– At least one sensor channel per color channel– Both product embedded and space deployed
Copyright Telelumen LLC 2018 All Rights Reserved
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Tunable spectrum challenges
• Color mixing – Less challenging for area sources
• Complete mixing may not be desirable in all cases
– More challenging for directed beam sources• No colored shadows
Copyright Telelumen LLC 2018 All Rights Reserved
![Page 8: Spectral Tuning and Daylight - Energy.govLED TRACK DISCUSSION III: LUMINAIRE CONCEPTS Spectral Tuning and Daylight Steve Paolini, Telelumen LLC. 30JAN19. Westin Hotel, Dallas, TX •](https://reader033.vdocument.in/reader033/viewer/2022041607/5e354a42fe77bc58975bf6cc/html5/thumbnails/8.jpg)
Tunable spectrum challenges
• Missing, inefficient wavelengths – Green gap, amber– No gaps from UV through IR– Efficiency a better metric than efficacy
• Efficient high luminance sources– Narrower beam than lambertian out of chip
Copyright Telelumen LLC 2018 All Rights Reserved
![Page 9: Spectral Tuning and Daylight - Energy.govLED TRACK DISCUSSION III: LUMINAIRE CONCEPTS Spectral Tuning and Daylight Steve Paolini, Telelumen LLC. 30JAN19. Westin Hotel, Dallas, TX •](https://reader033.vdocument.in/reader033/viewer/2022041607/5e354a42fe77bc58975bf6cc/html5/thumbnails/9.jpg)
Human centric challenges
• Human studies in the field with actual daylight– Track actual SPD exposure during the day over
various applications over various conditions
Copyright Telelumen LLC 2018 All Rights Reserved
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Efficacy vs. Efficiency
• Efficacy = lumens per electrical watt• Efficiency = optical watts per electrical watt
• Lumens are a weighted measure of optical watts with a peak at 555nm (green) and falling off toward red and blue.
Copyright Telelumen LLC 2018 All Rights Reserved
![Page 11: Spectral Tuning and Daylight - Energy.govLED TRACK DISCUSSION III: LUMINAIRE CONCEPTS Spectral Tuning and Daylight Steve Paolini, Telelumen LLC. 30JAN19. Westin Hotel, Dallas, TX •](https://reader033.vdocument.in/reader033/viewer/2022041607/5e354a42fe77bc58975bf6cc/html5/thumbnails/11.jpg)
Eye cone response for “standard observer”
Weighting for lumen
visiblespectrum
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Octa – direct-green option
Telelumen LLC, copyright 2018, all rights reserved
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Octa – violet option
Telelumen LLC, copyright 2018, all rights reserved
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Efficacy vs. Efficiency
Copyright Telelumen LLC 2018 All Rights Reserved
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Copyright Telelumen LLC 2019 All Rights Reserved
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In general - SPD
• A more continuous spectrum and wider range of wavelengths produce higher color quality light sources.
• A less continuous spectrum and truncated range of wavelengths are often more efficacious.
Copyright Telelumen LLC 2018 All Rights Reserved
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Copyright Telelumen LLC 2019 All Rights ReservedData courtesy of Roland Connelly, AATCC
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Copyright Telelumen LLC 2019 All Rights ReservedData courtesy of Dieter Lang, LEDVANCE, Germany
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Reflectance Spectra of Skinhalf is between 600nm – 700nm
From: ”Face colour under varying illumination”, Chapter. 4; http://herkules.oulu.fi/isbn9514267885/html/i1030756.html
CaucasianAsian
African
© 2002 Oulu University Library
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In the beginning
• Daylight• Fire
• Continuous spectrum• Intensity and spectrum change with time
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Copyright Telelumen LLC 2019 All Rights Reserved
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Daylight Recording Locations
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Copyright Telelumen LLC 2019 All Rights Reserved
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Copyright Telelumen LLC 2019 All Rights Reserved
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Como Italy Sky Light – May16
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Day of sunlight• Illuminance sensor pointed up at a mostly blue sky in
Saratoga, California
• Starts: 28JUN18 at 05:48Ends: 28JUN18 at 20:48
• Lux range in actual recording: 10,000:1
• Color temperature range: 5,700K to 70,000K
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Copyright Telelumen LLC 2019 All Rights Reserved
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Copyright Telelumen LLC 2019 All Rights Reserved
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Copyright Telelumen LLC 2019 All Rights Reserved
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Summary
• Human centric lighting is rooted in our daylight experience.
• Daylight is complex – continuous spectrum and time are key.
• Multi-spectral luminaires are needed to replicate and maximize the value of the visible spectrum.
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